How does AutoHotkey hot strings work? Is it detectable like copy/paste is?

Is there any way for a website to detect that I’m using AutoHotkey on Chrome instead of typing out the full thing? I used https://www.keyboardtester.com/ to test and it detects a backspace and all the letters typed out immediately as opposed to Ctrl+C which it detects as Ctrl+C only. I’m not sure how the site works but I’m guessing whatever javascript code runs in the background detects all the characters pressed. Would it be the same for any other website?

Also, sometimes the strings are missing a few characters like Hell World instead of Hello World. I thought if I knew how hot strings worked, I could fix it or at least find a workaround.